265021020020 has 24 divisors (see below), whose sum is σ = 556654539168. Its totient is φ = 105987380000.

The previous prime is 265021020013. The next prime is 265021020037. The reversal of 265021020020 is 20020120562.

It is a super-2 number, since 2×265021020020² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 265021019974 and 265021020001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1210706 + ... + 1412745.

It is an arithmetic number, because the mean of its divisors is an integer number (23193939132).

Almost surely, 2^265021020020 is an apocalyptic number.

265021020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265021020020 is an abundant number, since it is smaller than the sum of its proper divisors (291633519148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265021020020 is a wasteful number, since it uses less digits than its factorization.

265021020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628511 (or 2628509 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 265021020020 its reverse (20020120562), we get a palindrome (285041140582).

The spelling of 265021020020 in words is "two hundred sixty-five billion, twenty-one million, twenty thousand, twenty".